<template>
    <el-container class="home_class">
      <!-- 头部区域 -->
      <el-header>
        <div>
          <img src="../assets/heima.png" alt="" srcset="">
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
        </el-header>
      <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="isCollapse?'64px':'200px'">
          <!-- 折叠按钮 -->
          <div class="toggle_button"  @click="toggleCollapse">|||</div>
          <!-- 侧边栏菜单区域 -->
              <el-menu
                background-color="#333744"
                text-color="#fff"
                active-text-color="#409efe"
                unique-opened
                :collapse='isCollapse'
                :collapse-transition='false'
                router
                :default-active='activePath'>
                <!-- 1级菜单 -->
                <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                  <!-- 一级菜单模板 -->
                  <template slot="title">
                    <!-- 图标 -->
                    <i :class="iconsObj[item.id]"></i>
                    <!-- 文本 -->
                    <span>{{item.authName}}</span>
                  </template>
                  <!-- 二级菜单 -->
                   <el-menu-item
                   :index="'/'+subItem.path"
                   v-for="subItem in item.children"
                   :key="subItem.id"
                   @click="saveNavState('/'+subItem.path)">
                     <!-- 2级菜单模板 -->
                      <template slot="title">
                        <!-- 图标 -->
                        <i class="el-icon-menu"></i>
                        <!-- 文本 -->
                        <span>{{subItem.authName}}</span>
                      </template>
                   </el-menu-item>
                </el-submenu>
              </el-menu>
        </el-aside>
        <!-- 页面主体区域 -->
        <el-main>
          <!-- welcome路由占位符 -->
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
</template>
<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址保存
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 登出功能 并返回带登录页面
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.console.error('res.meta.msg')
      this.menuList = res.data
    },
    // 点击按钮切换菜单折叠
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>
<style lang="less" scoped>
// element-ui标签名就是类名
// 头部背景
.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #ffffff;
  font-size: 20px;
  >div{
    display: flex;
    align-items: center;
    span{
      margin-left: 15px;
    }
  }
}
// 侧边栏背景
.el-aside{
  background-color: #333744;
  // 取消边框线使菜单栏对齐不超出容器
  .el-menu{
    border-right: none;
  }
}
// 主题颜色
.el-main{
background-color: #eaedf1;
}
// 让组件全屏
.home_class{
  height: 100%;
}
// 侧边栏的图标和文字分开
.iconfont{
  margin-right: 10px;
}
// 侧边栏按钮
.toggle_button{
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #ffffff;
  text-align:center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
